(1. 北京科技大學 土木與環(huán)境工程學院, 北京 100083；
2. 中國科學院 過程工程研究所 生化工程國家重點實驗室, 北京 100190)
摘 要: 以廣西某極難浸石煤釩礦為研究對象，研究循環(huán)流態(tài)化焙燒試樣在加壓浸出條件下的釩浸出率。結果表明：在相同酸浸條件下，循環(huán)流態(tài)化空白焙燒試樣的釩浸出率高于鈉化焙燒的釩浸出率。系統(tǒng)的焙燒−浸出工藝對比研究表明：該石煤釩礦只有在循環(huán)流態(tài)化焙燒并加壓高濃度酸浸作用下才能獲得最高的釩浸出率，應屬于極難浸石煤釩礦。在V(H2SO4):V(HF)=1:1和MnO2添加量(質量分數(shù))為3%的條件下，循環(huán)流態(tài)化空白焙燒礦的最佳酸浸條件為液固比1:1、浸出溫度150 ℃、浸出時間6 h，釩浸出率可達98.11%。同時，研究循環(huán)流態(tài)化空白焙燒礦加壓浸出的動力學模型、浸出控制步驟及表觀活化能。循環(huán)流態(tài)化空白焙燒能避免鈉化焙燒產生的Cl2及HCl等有害氣體的排放問題。從焙燒反應設備的創(chuàng)新應用著手，探索試驗工藝條件，為極難浸石煤釩礦的工業(yè)化利用提供參考和依據(jù)。
關鍵字: 極難浸石煤釩礦；循環(huán)流態(tài)化焙燒；加壓浸出；動力學模型
（1. School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China;
2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences,
Beijing 100190, China）
Abstract:Based on the hardest refractory stone coal containing vanadium from Guangxi, China, the leaching rate of vanadium under the condition of recirculating fluidized roasting and pressure leaching was studied. The results indicate that the leaching rate of vanadium of blank fluidized roasting is higher than that of the sodium treated one under the same acid-leaching condition. The systematic technical comparative research on roasting and leaching indicates that this stone coal is indeed the hardest refractory one because the mineral can only obtain the highest leaching rate of vanadium if it is treated by recirculating fluidized roasting and pressure leaching. Under the condition that the volume ratio of H2SO4 to HF is 1:1 and the mass fraction of MnO2 addition is 3%, the best acid leaching requirement of the recirculating fluidized blank roasting sample is that the ratio of liquid to solid is 1:1, the leaching temperature is 150 ℃, and the leaching time is 6 h. The leaching rate of vanadium can be up to 98.11%. Meanwhile, the pressure leaching kinetic model, the leaching control step and the leaching apparent activation energy of the recirculating fluidized blank roasting sample were studied. The discharging problem of harmful gas like Cl2 and HCl from sodium treated roasting can be avoided by using recirculating fluidized blank roasting. Based on the innovational application of the roasting reaction device, the exploration of experimental techniques will provide some references and judgments for the industrial utilization of the hardest refractory stone coal.
Key words: hardest refractory stone coal containing vanadium; recirculating fluidized roasting; pressure leaching; kinetic model
